HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>chained .blur()</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 400px; }
    label { display: block; margin-bottom: 6px; font-weight: 600; }
    #email { width: 100%; padding: 10px 12px; border: 2px solid #cbd5e1; border-radius: 6px; font-size: 16px; box-sizing: border-box; }
    #email.touched { border-color: #6366f1; background: #eef2ff; }
    #out { margin-top: 12px; padding: 10px; background: #f0fdf4; border-radius: 6px; color: #166534; font-family: monospace; font-size: 14px; min-height: 1.2em; }
  </style>
</head>
<body>
  <label for="email">Email (try extra spaces)</label>
  <input type="text" id="email" placeholder="  jane@example.com  ">
  <div id="out">Tab away to trim and mark as touched.</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#email")
      .blur(function() {
        var val = $(this).val().trim();
        $(this).val(val);
        $("#out").text("Trimmed on blur: " + val);
      })
      .blur(function() {
        $(this).toggleClass("touched", true);
      });
  </script>
</body>
</html>

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jQuery chained .blur(handler) — trim and mark touched (Try It)